Return bend for cracking coils in oil stills



June 12, 1934. F, c. FANTZ I RETURN BEND FQR CRACKING CCILS IN OIL STILLS Filed Feb. l5. 193.3 2 Sheets-Sheet 1 INVENTOR I ZMM ATTORNEY 4 12,1934. c FANTZ 7 1,962,863 v RETURN BEND FOR CRACKING (JOILIS IN OIL STILLS Filed Feb. 15', 1933 2 Sheets-Shea; 2

FIG. 4.

INVENTOR /w40 a B 0410M ORNEY Patented "June-12,- 1934 RETURN BEND FOR CRACKING coils in on. STILLS Fred C. Fantz, Webster Groves, Mo. Application February 15, 1933, Serial No; 656,798 3 Claims. (01. 285-) My'invention relates to that class of return bends, in which the housing therefor is formed in sections andhas for its principal object to :provide an improved construction for the housing. It is well known that the industry is recognizing the fact that the rolled in tube is no longer to be considered the best type of attachment, for the housing to connect the return bend to the end of the tube, and tubes with upset shoulders, which are demountably mounted in housings, are. rapidly coming into use.

This being largely due to the fact that it is highly desirable in view of the fact that the refiners are a being forced to higher pressures and higher temperatures by the demands oithe trade that the tubes be demount'ablymounted in the still so that they can be removed for inspection or replacement or moved to a less hazardousportion of the still or turned over in the event that they bow or sag from the heat and pressure which is a constant occurrence.

A further object of my invention is to provide a .demountable' housing for ithe tube which will not require any sectional or other bushings to be mounted intermediate the housing and the still tubes.

My means of accomplishing the foregoing objects may be. more readily understood by having reference to the accompanying drawings which are hereunto annexed and are a part of this speciiication, in which Fig. 1 is a side elevation of my improved device, a portion of the wall 'of the housing being broken away to show the manner in which the tubes are mounted inside of it;

Fig. 2 is a top or plan view of the same, the

U orreturn bend being omitted;

Fig. 3 is an end view oflmy deviceas shown in Fig. l; and

Fig.4 is a section on the line 4;4in Fig. 1, the U or return bend being omitted 'for clearness. Similar reference numerals refer to similar parts throughout the entire description.

As shown in the drawings, a conventional retum bend 1 is provided to connect a pair of adjacent still tubes 2 and 3. These tubes are provided with externalshoulders 4 which may be formed by upsetting the tubes inthe usual manner. The

return bend 1 is mounted inside of a sectional housing formed in two parts 5 and 6.. The housing is provided with upwardly extending side walls 7 and 8 which are arcuate in cross section andare preferably provided with circumferential slots 9 adjacent their upper ends in which are mounted toggles 10 .which carry set screws 11, the inner 'clined walls which are adapted to engage correspondingly inclined walls 21 formed on the halves extending side walls 7 and 8 are provided with so "lugs 13 and 14 which abut and which are provided with passageways which extend therethrough. .In these passageways I'mount suitable securing pins 16 which'fmay, if desired, be

secured in place by means of cotter pins'15, as shown in Fig. 2,-the left hand pin is removed.

It will be apparent to persons skilled in the art that when these pins are inserted into the openings to which they are fitted that the housing will be to all intents and Purp ses a one piece housing and" the internal shoulders 17 will abut the shoulders 4 formed on the tubes 4 and 2-so that by tightening the-set screws 11 in v the toggles 10 the return bend will be forced into a tight Joint with the ends ,0! the tube. I Additional securing means for locking the halves together may be provided. In the detail view, Fig. 4, I have shown one form in which I provide a saddle 20 which is provided with in- 5 and 6 of the housing. By tightening the screw 22, it will be apparent that the central portions of the housing will be drawn'tightly together and securely locked.

From the foregoing description it will be apparent, unless the additional lock is emploued, that all that is necessary to do is to remove one of the pins 16 when thehousing can be swung on the pin at the other end of the housing which will operate to disengage sth'eajnnular shoulders from the upset portions'of the tube and the housing can be easily removed. At the same time if all that is ne e ary to do it to remove the return bend so to gain access to the interior of the tubes for cleaning purposes, this can 'be done without removing either of the pins 16 or the saddles 20 and the housing will be. practically a one piece housing which will serve to hold the tubes in alinement so that the return no bend can be replaced without diflicultyand a tight joint secured.

It will beapparent from the foregoing description that if desired, both pins may bewithdrawn and the halves lifted apart. It may also be found desirable in this construction to provide. for the clearance shown in myPatent No. 1,874,003. This will permit closer nesting of the tubes. v

described my'invention what I regard as no new and desire to secure by Letters Patent is:

1. In a refinery apparatus, a conventional return hend adapted to connect a pair of shouldered still tubes to provide a continuous passageway therethrough, a housing for said return hend formed in halves, lugs at the outer end of said housing, a hinge pin mounted therein, detachable means to lock the other ends of said housing, arcuate shoulders on said halves, which engage the shoulders on the tubes when the housing is closed, upwardly extending side walls on said housing, detachable means mounted therein to draw the bend and the tubes into a tight v.fit'lillli.

2. In a refinery apparatus, a conventional return bend adapted to connect a pair of shouldered still tubes to provide a continuous passageway therethrough, a housing for said return bend formed in halves, lugs at the outer end of each half of said housing, hinge pins mounted therein,

arcuate shoulders on saidflhalves which engage I the shoulders on the tube when the housing is closed, upwardly extending side walls on said housing, detachable meansmounted thereinvto draw thehend and tubes into a tight joint;

3. In a refinery apparatus, a conventional return bend adapted to connect a pair of shouldered still tubes to provide a continuous passageway therethrough, a housing for said return bend formed in halves, lugs at the outer end of said housing, a hinge pin mounted therein, tie-- tachable means to lock the other end to said housing, arcuate shoulders on said halves which engage the shoulders on the tubes when the housing is closed, upwardly extending side walls on said housin detachable means mounted therein to draw the bend and tubes into a tight joint, means mounted intermediate said tubes to secure and lock said halves together.

Flam C, FANTZ; 

